Champions.

Champions can turn into stone.
Champions have access to healing and judgement spells along with demons bane, making them a Paladin.
Paladins are a combination of a Warrior and Cleric.
Clerics by definition are a priest or religious leader.
Priests are a person authorized to perform the sacred rituals of a religion.
Religion is the belief in and worship of a superhuman controlling power, especially a personal God or gods.

So the question is, who is the god that the Champions serve?
Simple, go back up. Champions can turn into stone. what being do we know that is made of Stone? Terock.